The 36-year-old royal – who has been patron of East Anglia's Children's Hospices (EACH) since 2012 – wrote in her letter: 'Spending quality time together is such an important aspect of family life and for me, as a mother, it is the simple family moments like playing outside together that I cherish.'

'Together we can champion the vital role that children's hospices play in helping seriously ill children and families to have more precious moments,' she added.

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The Duchess was being a hands-on-mother at Prince Harry and Meghan Markle's wedding over the weekend, during which she looked after the bridesmaids and page boys which included George, four, and Charlotte, three.

Kate even arrived after the Queen, who – due to royal ranking – is usually the last member of the royal family to arrive to any royal event, as she was helping to co-ordinate the little ones with their special jobs.

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She looked elegant in a primrose yellow wool silk tailored coat by Alexander McQueen she's previously worn before, which she teamed with a Philip Treacy hat and shoes by Jimmy Choo.